Windshield cleaning system

Claim 1

A HYDRAULICALLY OPERATED WINDSHIELD WIPER ACTUATING SYSTEM INCLUDING, A SOURCE OF HYDRAULIC FLUID UNDER PRESSURE, PURESSURE REGUALTING MEANS FOR CONTROLLING THE PRESSURE POTENTIAL OF SAID SOURCE COMPRISING A SPRING LOADED RELIEF VALVE AND A SERVO PISTON DISPOSED IN A SERVO CHAMBER FOR VARYING THE LOAD ON SAID SPRING, A WIPER MOTOR HAVING A DIFFERNTIAL AREA RECIPROCABLE PISTON, A MANUAL CONTROL VALVE FOR THROTTING THE FLOW OF HYDRAULIC FLUID TO SAID MOTOR AND FOR CONTINUOUSLY PRESSURIZING THE SMALLER AREA OF SAID MOTOR PISTON, VALVE MEANS CONNECTING SAID SERVO CHAMBER AND SAID WIPER MOTOR FOR LOADING SAID SPRING IN ACCORDANCE WITH THE DEMANDS OF SAID MOTOR, SERVO ACTUATED REVERSING VALVE MEANS CONTROLLED BY MOVEPISTON AREA TO DRAIN AND PRESSURE TO RECIPROCCATE SAID PISTON, PISTON AREA TO DRAIN AND PRESSURE TO RECIPROCATE SAID PISTON AND MEANS ACTUATEDBY SAID PISTON FOR MOVING SAID VALVE MEANS TO CONNECT SAID SERVO CHAMBER TO DRAIN WHEN MOVEMENT OF SAID PISTON IS ARRESTED BY POSITIONING SAID MANUAL CONTROL VALVE IN THE "OFF" POSITION.